My first thought about the flowers was that the Marshal sent them to Teller-Morrow pretending they were from Providence to start stirring the pot... His goal seems to be to punish Tara at this point, and that would go hand in hand with that. ...

Even though the exact cause is irrelevant, I did like the occasional flashback to the beginning of the breakout. It was interesting to see the writers interpretation of how society crumbled. I wouldn't be opposed to throwing one in thats relevant to the episode every once in a while...